Problem #8






What are the last four digits of
                       1998  
                     .       
                   .         
                 .            
             1998
         1998
     1998
where "1998" appears 1998 times?

[Recall that iterated exponents are computed from "top to bottom". For example:
              
               3  
              3 
             3
is equal to 3^(3^3)=3^27.]




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